Simplify the Rational Expression $\frac { 25 \left( x ^ { 2 } - 3 \right) ^ { 3 } + 125 x \left( x ^ { 2 } - 3 \right) ^ { 4 } } { 625 \left( x ^ { 2 } - 3 \right) ^ { 3 } }$

Multiple Choice

Simplify the rational expression. Use factoring, and assume all variable expressions represent positive real numbers.
- $\frac { 25 \left( x ^ { 2 } - 3 \right) ^ { 3 } + 125 x \left( x ^ { 2 } - 3 \right) ^ { 4 } } { 625 \left( x ^ { 2 } - 3 \right) ^ { 3 } }$

A) $\frac { 1 + 5 x ^ { 3 } - 15 x } { 25 }$
B) $\frac { 1 - 5 x ^ { 3 } - 15 x } { 125 }$
C) $\frac { 1 + 5 x ^ { 3 } + 15 x } { 25 }$
D) $\frac { 1 - 5 x ^ { 3 } + 15 x } { 125 }$